Folding wheelchair

Abstract

The invention discloses a folding wheelchair which comprises a backrest, a rear support, a first locking shaft arranged at the end of the rear support and a first locking hook rotationally arranged at the end of the backrest. The backrest and the rear support are hinged to form a hinge point B; the first locking hook is provided with a first hook groove and a second hook groove, when the folding wheelchair is in an unfolded state, the first hook groove is clamped to the first locking shaft, and when the folding wheelchair is in a folded state, the second hook groove is clamped to the first locking shaft; the first hook groove is positioned on one side of the hinge point B, and the second hook groove is positioned on the other side of the hinge point B; the angle formed by the connecting line of the first hook groove and the hinge point B and the connecting line of the second hook groove and the hinge point B is equal to the relative rotation angle of the backrest and the rear support before and after folding of the folding wheelchair, and the distance between the first hook groove and the hinge point B and the distance between the hinge point B and the first locking shaft are equal to the distance between the hinge point B and the first locking shaft. According to the folding wheelchair, the backrest and the rear support of the folding wheelchair can be locked when the folding wheelchair is in the unfolded state and the folded state.

Description

Technical Field

[0001] The present application relates to the technical field of medical devices, and in particular to a folding wheelchair. Background Art

[0002] A folding wheelchair is an auxiliary tool that can help people with limited mobility to move; with the development of technology, folding wheelchairs have been widely used in people's lives. In the prior art, a first four-bar linkage assembly and a second four-bar linkage assembly are provided in the folding wheelchair. When the first four-bar linkage assembly moves, the second four-bar linkage assembly moves, so that the folding wheelchair switches between the unfolded state and the folded state.

[0003] However, in the prior art, when the folding wheelchair is in the unfolded state and the folded state, the backrest and the rear support hinged in the first four-link assembly are prone to relative movement, resulting in the folding wheelchair being unable to stably maintain the corresponding state, giving the user a poor user experience. Summary of the invention

[0004] The object of the present application is to provide a folding wheelchair, which can lock a backrest and a rear support of the folding wheelchair when the folding wheelchair is in an unfolded state and a folded state.

[0005] The embodiment of the present application is implemented as follows: The present application provides a folding wheelchair, which comprises a backrest, a rear support, a first locking shaft and a first locking hook; wherein the backrest is hinged with the rear support to form a hinge point B; the first locking shaft is arranged at the end of the rear support, and the first locking hook is rotatably arranged at the end of the backrest; a first hook groove and a second hook groove are arranged on the first locking hook, when the folding wheelchair is in an unfolded state, the first hook groove is engaged with the first locking shaft, and when the folding wheelchair is in a folded state, the second hook groove is engaged with the first locking shaft; when the folding wheelchair is in an unfolded state and a folded state, the first hook groove is located on one side of the hinge point B, and the second hook groove is located on the other side of the hinge point B; the line connecting the first hook groove and the hinge point B, and the line connecting the second hook groove and the hinge point B, form a target angle, the target angle is equal to the relative rotation angle of the backrest and the rear support before and after the folding wheelchair is folded, the distance between the first hook groove and the hinge point B is equal to the distance between the hinge point B and the first locking shaft, and the distance between the second hook groove and the hinge point B is equal to the distance between the hinge point B and the first locking shaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0007] Figure 1 This is a schematic diagram of the folding wheelchair shown in this application in an unfolded state. Figure 1 ; Figure 2 A partial explosion diagram of the folding wheelchair shown in this application Figure 1 ; Figure 3 This is a schematic diagram of the connection between the first four-bar linkage assembly and the second four-bar linkage assembly shown in the present application; Figure 4 for Figure 3 The corresponding explosion diagram; Figure 5 This is a schematic diagram of the folding wheelchair shown in the present application in a folded state; Figure 6 This is a schematic diagram of the first hook groove and the first locking shaft shown in the present application when they are engaged; Figure 7 This is a schematic diagram of the second hook groove shown in the present application being engaged with the first locking shaft; Figure 8 for Figure 6 A partial enlarged schematic diagram of V1 in the middle; Fig. 9 The movement diagram of the first locking hook shown in this application Figure 1 ; Fig.10 The movement diagram of the first locking hook shown in this application Figure 2 ; Fig.11 The movement diagram of the first locking hook shown in this application Figure 3 ; Fig.12 The movement diagram of the first locking hook shown in this application Figure 4 ; Fig.13 A partial explosion diagram of the folding wheelchair shown in this application Figure 2 ; Fig.14 Schematic diagram of the first locking hook, the second locking hook and the bracket shown in this application Figure 1 ; Fig.15 Schematic diagram of the first locking hook, the second locking hook and the bracket shown in this application Figure 2 ; Fig.16 A partial explosion diagram of the leg support assembly shown in this application Figure 1 ; Fig.17 This is a schematic diagram of the folding wheelchair shown in this application in an unfolded state. Figure 2 ; Fig.18 The cross-sectional view of the leg support assembly shown in this application Figure 1 ; Fig.19 A partial explosion diagram of the leg support assembly shown in this application Figure 2 ; Fig. 20 This is a schematic diagram of the leg support body shown in the present application when it is at an initial angle; Fig.21 The cross-sectional view of the leg support assembly shown in this application Figure 2 ; Fig. 22 The cross-sectional view of the leg support assembly shown in this application Figure 3 ; Fig.23 The rotation diagram of the leg support body shown in this application Figure 1 ; Fig.24 The cross-sectional view of the leg support assembly shown in this application Figure 4 ; Fig.25 This is a schematic diagram of a case where the positions of the hinge points in the first four-link assembly shown in the present application have a first proportional relationship; Fig.26 for Fig.25 The corresponding schematic diagram of the folding wheelchair after folding; Fig. 27 This is a schematic diagram of a case where the positions of the hinge points in the first four-link assembly shown in the present application have a second proportional relationship; Fig.28 for Fig. 27 The corresponding schematic diagram of the folding wheelchair after folding; Fig.29 This is a schematic diagram of a case where the positions of the hinge points in the first four-link assembly shown in the present application have a third proportional relationship; Fig.30 for Fig.29 The corresponding schematic diagram of the folding wheelchair after folding; Fig.31 It is a schematic diagram of a case where the positions of the hinge points in the first four-link assembly in the prior art have a first target proportional relationship; Fig.32 for Fig.31 The corresponding schematic diagram of the folding wheelchair after folding; Fig.33 It is a schematic diagram of a case where the positions of the hinge points in the first four-link assembly in the prior art have a second target proportional relationship; Fig.34 for Fig.33 The corresponding schematic diagram of the folding wheelchair after folding; Fig.35 It is a schematic diagram of a case where the positions of the hinge points in the first four-link assembly in the prior art have a third target proportional relationship; Fig.36 for Fig.35 The corresponding schematic diagram of the folding wheelchair after folding.

[0008] Reference numerals: 10-folding wheelchair; 100-front support; 101-front wheel; 200-backrest; 210-first locking hook; 211-rotating part; 212-first locking part; 213-first hook body; 214-first hook groove; 215-second locking part; 216-second hook body; 217-second hook groove; 220-second locking hook; 230-linking rod; 231-first connecting rod; 240-bracket; 241-first fixed protrusion; 242-second fixed protrusion; 243-first elastic element; 251-first limiting through hole; 252-second limiting through hole; 300-rear support; 301-rear wheel; 302-first locking shaft; 303-second locking shaft; 400-pull rod; 500-seat support rod; 600-seat; 610-mounting frame; 611-accommodating through hole; 700-leg support assembly; 711-locking switch; 712- First pressing block; 713-fastening pin; 714-second elastic element; 720-connecting component; 721-adjusting hole; 730-leg support body; 731-first protrusion; 732-second protrusion; 733-installation slot; 734-first locking pin; 735-second locking pin; 736-first unlocking assembly; 737-second unlocking assembly; 738-first rotating shaft; 739-third elastic element; 2411-first Axle body; 2421-second axis body; 2511-first surface; 2512-second surface; 7121-slope; 7122-through hole; 7131-first clamping protrusion; 7311-first end face; 7312-second end face; 7313-first through hole; 7321-second through hole; 7331-limiting protrusion; 7361-first unlocking pin; 7362-guide column; 7363-fourth elastic element; 73621-abutment section; 73622-guide section; 73623-fixed section. DETAILED DESCRIPTION

[0009] The folding wheelchair 10 is provided with a first four-bar linkage assembly and a second four-bar linkage assembly. When the first four-bar linkage assembly is actuated, the second four-bar linkage assembly is driven to actuate, so that the folding wheelchair 10 switches between the unfolded state and the folded state. However, in the prior art, when the folding wheelchair 10 is in the unfolded state and the folded state, the backrest 200 and the rear support 300 hinged in the first four-bar linkage assembly are prone to relative movement, resulting in the folding wheelchair 10 being unable to stably maintain the corresponding state. In order to solve the above problems, the present application provides a folding wheelchair 10, and the technical solution of the folding wheelchair 10 of the present application will be clearly and completely described below in conjunction with the accompanying drawings.

[0010] like Figure 1-Figure 4As shown, the folding wheelchair 10 in the embodiment of the present application includes a first four-bar linkage assembly and a second four-bar linkage assembly; the first four-bar linkage assembly includes a front support 100, a backrest 200, a rear support 300 and a pull rod 400 which are hinged in sequence; the second four-bar linkage assembly includes a front support 100, a seat support rod 500, a seat cushion 600 and a backrest 200 which are hinged in sequence. In the first four-bar linkage assembly, the front support 100, the backrest 200, the rear support 300 and the pull rod 400 are hinged to form hinge points A, B, C and D; in the second four-bar linkage assembly, the front support 100, the seat support rod 500, the seat cushion 600 and the backrest 200 are hinged to form hinge points E, F, G and A. Specifically, the folding wheelchair 10 has a front wheel 101 and a rear wheel 301, and the front wheel 101 and the rear wheel 301 are used to contact the surface on which the folding wheelchair 10 is placed to support the folding wheelchair 10. The first end of the front support 100 is used to install the front wheel 101 of the folding wheelchair 10, and the second end of the front support 100 is hinged to the first end of the backrest 200 to form a hinge point A; the first end of the rear support 300 is used to install the rear wheel 301 of the folding wheelchair 10, and the second end of the rear support 300 is hinged to the backrest 200 to form a hinge point A. The first end of the pull rod 400 is hinged to the rear support 300 to form a hinge point C, and the second end of the pull rod 400 is hinged to the front support 100 to form a hinge point D; the first end of the seat cushion support rod 500 is hinged to the front support 100 to form a hinge point E, the second end of the seat cushion support rod 500 is hinged to the seat cushion 600 to form a hinge point F, and the end of the seat cushion 600 away from the hinge point F is hinged to the first end of the backrest 200 to form a hinge point G.

[0011] During an operation, when the folding wheelchair 10 is in a state such as Figure 1 In the unfolded state shown, the user can push the backrest 200 to move the backrest 200 toward Figure 1 The first four-bar linkage assembly moves when the backrest 200 rotates in the first direction S1 as indicated by the middle arrow. The first four-bar linkage assembly moves while driving the second four-bar linkage assembly to move. When both the first four-bar linkage assembly and the second four-bar linkage assembly move to the specified positions, the folding wheelchair 10 is transformed into the following state: Figure 5 When the folding wheelchair 10 is in the folded state shown in FIG. Figure 5 In the folded state shown, the user can pull the backrest 200 to move the backrest 200 toward Figure 5 The backrest 200 rotates in the second direction S2, and the first four-bar linkage assembly moves; the first four-bar linkage assembly moves while driving the second four-bar linkage assembly to move; when the first four-bar linkage assembly and the second four-bar linkage assembly move to the specified position, the folding wheelchair 10 is transformed into Figure 1 Shown in expanded state.

[0012] Further, such as Figure 6 and Figure 7 As shown, the folding wheelchair 10 in this embodiment further includes a first locking shaft 302 and a first locking hook 210. The first locking shaft 302 is disposed at the second end of the rear support 300; the first locking hook 210 is rotatably disposed at the first end of the backrest 200. The first locking hook 210 is provided with a first hook groove 214 and a second hook groove 217.

[0013] The following relationship exists between the first hook groove 214 and the second hook groove 217 and the hinge point B: (1) When the foldable wheelchair 10 is in the unfolded state and the folded state, the first hook groove 214 is located on one side of the hinge point B, and the second hook groove 217 is located on the other side of the hinge point B.

[0014] (2) When the folding wheelchair 10 is in the unfolded state and the folded state, the line L1 between the first hook groove 214 and the hinge point B, and the line L2 between the second hook groove 217 and the hinge point B form a target angle α, which is equal to the angle of relative rotation between the backrest 200 and the rear support 300 before and after the folding of the folding wheelchair 10. For example, assuming that the angle between the front backrest 200 and the rear support 300 before and after the folding is 240°, and the angle between the rear backrest 200 and the rear support 300 before and after the folding is 40°, the angle of relative rotation between the front backrest 200 and the rear support 300 before and after the folding of the folding wheelchair 10 is 200°, and the above target angle is 200°.

[0015] (3) When the folding wheelchair 10 is in the unfolded state and the folded state, the distance between the first hook groove 214 and the hinge point B, i.e., the distance L1, is equal to the distance between the hinge point B and the first locking axis 302, and the distance between the second hook groove 217 and the hinge point B, i.e., the distance L2, is equal to the distance between the hinge point B and the first locking axis 302.

[0016] The applicant found that when the above conditions (1), (2) and (3) are satisfied simultaneously between the first hook groove 214 and the second hook groove 217 and the hinge point B; if the folding wheelchair 10 is in the unfolded state, the first hook groove 214 will be engaged with the first locking shaft 302, and after the engagement is completed, the backrest 200 and the rear support 300 are locked and cannot move relative to each other; if the folding wheelchair 10 is in the folded state, the second hook groove 217 will be engaged with the first locking shaft 302, and after the engagement is completed, the backrest 200 and the rear support 300 are locked and cannot move relative to each other.

[0017] It can be seen from the above content that in the embodiment of the present application, the backrest 200 and the rear support 300 can be locked when the folding wheelchair 10 is in the unfolded state and the folded state, so that the folding wheelchair 10 can be stably maintained in the corresponding state, which improves the user experience. Further, in the embodiment of the present application, the backrest 200 and the rear support 300 of the folding wheelchair 10 can be locked in the folded state and the unfolded state by using a locking hook and a locking shaft, so that the backrest 200 and the rear support 300 of the folding wheelchair 10 can be locked using a simple structure. In addition, in the present application, the method of locking the rear support 300 and the backrest 200 is simple and ingenious.

[0018] In one embodiment, the first locking shaft 302 may be a shaft body disposed on the rear support 300. Figure 2 , Figure 6 and Figure 7 As shown, the first locking shaft 302 may be a hinge point C between the pull rod 400 and the rear support 300. In this embodiment, the original structure of the folding wheelchair 10 is used as the first locking shaft 302, and there is no need to manufacture the first locking shaft 302 separately, which saves costs and simplifies the structure of the folding wheelchair 10.

[0019] Based on the above embodiments, Figure 8As shown, the first locking hook 210 includes a rotating part 211 rotatably connected to the backrest 200, a first locking part 212 connected to the rotating part 211 and extending along the first direction, and a second locking part 215 connected to the rotating part 211 and extending along the second direction. The first locking part 212 is connected to a first hook body 213 at one end away from the rotating part 211, and the extension direction of the first hook body 213 is opposite to the extension direction of the second locking part 215. When the first hook body 213 is connected to the first locking part 212, a first hook groove 214 is formed; the second locking part 215 is connected to a second hook body 216 at one end away from the rotating part 211, and the extension direction of the second hook body 216 is the same as the extension direction of the first locking part 212. When the second hook body 216 is connected to the second locking part 215, a second hook groove 217 is formed. Exemplarily, the second direction may be a direction parallel to the placement surface of the wheelchair, and the first direction may be a direction substantially perpendicular to the placement surface of the wheelchair; or, the second direction may be a direction presenting an obtuse angle with the placement surface of the wheelchair, and the first direction may be a direction presenting an acute angle with the placement surface of the wheelchair; or, the second direction may be a direction presenting an acute angle with the placement surface of the wheelchair, and the first direction may be a direction presenting an obtuse angle with the placement surface of the wheelchair. In this embodiment, by setting the structure of the first locking hook 210, when the folding wheelchair 10 is in the unfolded state, the first hook groove 214 on the first locking hook 210 can engage with the first locking shaft 302 to lock the backrest 200 and the rear support 300; further, when the folding wheelchair 10 is in the folded state, the second hook groove 217 on the first locking hook 210 can engage with the first locking shaft 302 to lock the backrest 200 and the rear support 300.

[0020] Based on the above embodiment, the folding wheelchair 10 further includes a first elastic element 243, which is disposed between the first locking hook 210 and the backrest 200. The first locking hook 210 is used to provide a force to engage the first hook groove 214 and the second hook groove 217 onto the locking shaft.

[0021] The principle of locking the backrest 200 and the rear support 300 by using the first elastic element 243, the first locking hook 210 and the first locking shaft 302 is explained below: like Figure 6 As shown, when the folding wheelchair 10 is in the unfolded state, the first hook groove 214 on the first locking hook 210 is engaged with the first locking shaft 302; Fig. 9As shown, when the folding wheelchair 10 is to be folded, the user first holds the first locking hook 210 to rotate the first locking hook 210 in the counterclockwise direction for a certain angle, so that the first hook groove 214 and the first locking shaft 302 are released from the match to unlock the backrest 200 and the rear support 300. During the rotation of the first locking hook 210, the first elastic element 243 undergoes elastic deformation; further, the backrest 200 of the folding wheelchair 10 is pushed to rotate the backrest 200 in the clockwise direction. After the backrest 200 rotates, the rear support 300 rotates in the counterclockwise direction. When the backrest 200 and the rear support 300 rotate in the above manner, the first hook groove 214 moves away from the first locking shaft 302, and the first locking hook 210 can be released. After the first locking hook 210 is released, the first elastic element 243 restores its elastic deformation to rotate the first locking hook 210 in the clockwise direction by a certain angle. Further, when the backrest 200 and the rear support 300 rotate in the above manner, the second hook body 216 gradually approaches the first locking shaft 302 and the second hook groove 217 faces the first locking shaft 302. Fig.10 As shown, when the second hook 216 contacts the first locking shaft 302, the first locking shaft 302 pushes the second hook 216 to rotate counterclockwise relative to the backrest 200 under the action of the rear support 300, and the first elastic element 243 undergoes elastic deformation during the rotation of the second hook 216; Figure 7 As shown, when the backrest 200 and the rear support 300 rotate to the specified position, the folding wheelchair 10 is completely in a folded state, the backrest 200 and the rear support 300 stop rotating, and the first elastic element 243 restores the elastic deformation to generate elastic force. Under the action of the above elastic force, the second hook body 216 rebounds in the clockwise direction, and the second hook groove 217 is engaged with the first locking shaft 302 to lock the backrest 200 and the rear support 300.

[0022] like Figure 7 As shown, when the folding wheelchair 10 is in the folded state, the second hook groove 217 on the first locking hook 210 is engaged with the first locking shaft 302; Fig.11As shown, when unfolding the foldable wheelchair 10, the user first holds the first locking hook 210 to rotate the first locking hook 210 in the counterclockwise direction for a certain angle, so that the second hook groove 217 and the first locking shaft 302 are released from the engagement to unlock the backrest 200 and the rear support 300; wherein, during the rotation of the first locking hook 210, the first elastic element 243 undergoes elastic deformation; further, the backrest 200 of the foldable wheelchair 10 is pulled to rotate the backrest 200 in the counterclockwise direction. After the backrest 200 rotates, The rear support 300 rotates in the clockwise direction; when the backrest 200 and the rear support 300 rotate in the above manner, the first hook 210 can be released after the second hook groove 217 is away from the first locking shaft 302. After the first locking hook 210 is released, the first elastic element 243 restores its elastic deformation to make the first locking hook 210 rotate in the clockwise direction by a certain angle; further, when the backrest 200 and the rear support 300 rotate in the above manner, the first hook body 213 gradually approaches the first locking shaft 302; Fig.12 As shown, when the backrest 200 and the rear support 300 rotate to a certain position, the first hook body 213 contacts the first locking shaft 302, and the first hook groove 214 deviates from the first locking shaft 302; at this time, the user holds the first locking hook 210 to rotate the first locking hook 210 counterclockwise relative to the backrest 200 by a certain angle, so that the first hook groove 214 faces the first locking shaft 302; wherein, during the rotation of the first locking hook 210, the first elastic element 243 undergoes elastic deformation; as shown in FIG. Figure 6 As shown, when the backrest 200 and the rear support 300 rotate to the specified position, the folding wheelchair 10 is fully in the unfolded state, and the backrest 200 and the rear support 300 stop rotating. At this time, the user releases the first locking hook 210, and the first elastic element 243 restores its elastic deformation to push the first locking hook 210 to rebound in the clockwise direction, so that the first hook groove 214 is engaged with the first locking shaft 302, thereby locking the backrest 200 and the rear support 300.

[0023] Based on the above embodiments, Fig.13 , Fig.14 and Fig.15As shown, a bracket 240 is provided at the first end of the backrest 200. It can be understood by those skilled in the art that the folding wheelchair 10 has two rear supports 300 and two front supports 100, and the two rear supports 300 and the two front supports 100 are symmetrically hinged on the end surface of the bracket 240. At the same time, the seat cushion 600 is also hinged to the bracket 240. A first fixing protrusion 241 is provided on the top surface of the bracket 240. The first fixing protrusion 241 is close to the rear support 300 where the first locking shaft 302 is located. A first shaft body 2411 is provided on the first fixing protrusion 241. The rotating portion 211 of the first locking hook 210 can be rotatably mounted on the first shaft body 2411. The first elastic element 243 is also mounted on the first shaft body 2411, and one end of the first elastic element 243 is connected to the first fixing protrusion 241, and the other end of the first elastic element 243 is connected to the first locking hook 210; illustratively, the first elastic element 243 can be a torsion spring. The bracket 240 is also provided with a rectangular first position-limiting through hole 251, through which the first locking portion 212 of the first locking hook 210 passes; the first position-limiting through hole 251 is used to limit the rotation angle of the first locking hook 210 when the first locking hook 210 rotates relative to the backrest 200. Exemplarily, the first position-limiting through hole 251 is provided with a first surface 2511 and a second surface 2512 opposite to each other. In the above embodiment, when the user does not hold the first locking hook 210, the first locking portion 212 abuts against the first surface 2511; when the user holds the first locking hook 210 to rotate the first locking hook 210, the first locking portion 212 abuts against the second surface 2512 so that the first locking hook 210 cannot rotate any more, thereby limiting the rotation angle of the first locking hook 210.

[0024] Based on the above embodiments, Fig.13 , Fig.14 and Fig.15As shown, the folding wheelchair 10 further includes a second locking hook 220 and a second locking shaft 303; wherein the second locking shaft 303 is disposed at the second end of the other rear support 300, the first locking shaft 302 and the second locking shaft 303 are disposed opposite to each other and are located between the two rear supports 300; the second locking hook 220 has the same shape as the first locking hook 210, and the first locking hook 210 and the second locking hook 220 are symmetrically disposed at the end of the backrest 200; specifically, a second fixing protrusion 242 may also be disposed on the top surface of the bracket 240, the second fixing protrusion 242 is close to the rear support 300 where the second locking shaft 303 is located, and the first fixing protrusion 241 and the second fixing protrusion 242 are disposed on the rear support 300 where the second locking shaft 303 is located, and the first fixing protrusion 241 and the second fixing protrusion 242 are disposed on the rear support 300 where the second locking shaft 303 is located. The second fixing protrusion 242 is arranged on the top surface of the bracket 240 at intervals; the second shaft body 2421 is arranged on the second fixing protrusion 242, the first shaft body 2411 and the second shaft body 2421 are located between the first fixing protrusion 241 and the second fixing protrusion 242, and the rotating part 211 of the second locking hook 220 can be rotatably sleeved on the second shaft body 2421. Of course, it can be understood that in addition to the first elastic element 243 of the above embodiment, another first elastic element is also provided, the first elastic element is sleeved on the second shaft body 2421, one end of the first elastic element is connected to the second fixing protrusion 242, and the other end of the first elastic element is connected to the second locking hook 220. The bracket 240 is also provided with a rectangular second limiting through hole 252, and the second locking part 215 of the second locking hook 220 passes through the second limiting through hole 252; the second limiting through hole 252 is used to limit the rotation angle of the second locking hook 220 when the second locking hook 220 rotates relative to the backrest 200. It can be understood that in this embodiment, the two hook grooves on the first lock hook 210 can be engaged with the first locking shaft 302, and the two hook grooves on the second lock hook 220 can be engaged with the second locking shaft 303, so as to achieve locking of the rear support 300 and the backrest 200 when the folding wheelchair 10 is in the unfolded state and the folded state, thereby improving the locking strength of the rear support 300 and the backrest 200. Among them, the principle of the engagement of the two hook grooves on the second lock hook 220 with the second locking shaft 303 is the same as the principle of the engagement of the two hook grooves on the first lock hook 210 with the first locking shaft 302, which will not be repeated here.

[0025] Based on the above embodiments, Figure 6 , Figure 7 , Figure 9-12 , Fig.14 and Fig.15As shown, the folding wheelchair 10 further includes a linkage rod 230, which is used to connect the first locking hook 210 and the second locking hook 220. The user can drive the linkage rod 230 to make the first locking hook 210 and the second locking hook 220 rotate synchronously. Exemplarily, the linkage rod 230 is located between the two rear supports 300, surrounds the outside of the first locking hook 210 and the second locking hook 220, and one end of the linkage rod 230 is connected to the first locking portion 212 of the first locking hook 210, and the other end of the linkage rod 230 is connected to the first locking portion 212 of the second locking hook 220.

[0026] Based on the above embodiments, Fig.14 and Fig.15 As shown, the folding wheelchair 10 further includes a first connecting rod 231 connected between the first locking hook 210 and the second locking hook 220 .

[0027] Based on the above embodiments, Fig.16 As shown, the folding wheelchair 10 also includes a leg rest assembly 700; wherein the leg rest assembly 700 includes an adjusting component, a leg rest body 730 and a connecting component 720 connected to the adjusting component and the leg rest body 730; the connecting component 720 is provided with a plurality of adjusting holes 721 arranged along the extension direction of the seat cushion 600, and the adjusting component includes a locking switch 711, a first pressing block 712 and a fastening pin 713; the first pressing block 712 is connected to the bottom of the seat cushion 600, the connecting component 720 is located below the first pressing block 712, one end of the fastening pin 713 is connected to the locking switch 711, and the other end passes through the first pressing block 712 and extends into any adjusting hole 721 located below the first pressing block 712; a slope 7121 is provided on the surface of the first pressing block 712 facing the locking switch 711.

[0028] In practice, if Fig.17As shown, a part of the connecting component 720 located below the seat cushion 600 will be covered by the seat cushion 600, and the other part will be exposed for the user's legs to be placed thereon. To meet the needs of users with different leg lengths, the area of ​​the exposed connecting component 720 can be adjusted. When adjusting the exposed area of ​​the connecting component 720, the user can rotate the locking switch 711 in the first target direction to make the locking switch 711 rise along the slope 7121. Since the locking switch 711 is fixedly connected to the fastening pin 713, the locking switch 711 rises and drives the fastening pin 713 to rise synchronously, so that the fastening pin 713 moves out of the adjustment hole 721. After the fastening pin 713 is moved out, the connection component 720 is unlocked, and the user can move the connection component 720 along the extension direction of the seat cushion 600 to adjust the exposed area of ​​the connection component 720. After the adjustment is completed, the user can rotate the locking switch 711 in the second target direction to make the locking switch 711 descend along the slope 7121, and drive the fastening pin 713 to descend so that the fastening pin 713 enters the corresponding adjustment hole 721 to lock the connection component 720, thereby completing the adjustment of the exposed area of ​​the connection component 720.

[0029] Of course, it can be understood that the first pressing block 712 is provided with a through hole 7122, and the fastening pin 713 passes through the first pressing block 712 through the through hole 7122; the slope 7121 is arranged around the axis of the through hole 7122; when the slope 7121 rises according to the target rotation direction, the first target direction is the target rotation direction, and the second target direction is the opposite direction of the first target direction. Exemplarily, the target rotation direction can be clockwise or counterclockwise.

[0030] Based on the above embodiments, Fig.16 and Fig.18As shown, the leg support assembly 700 further includes a second elastic element 714, which is sleeved on the fastening pin 713 and abuts against the surface of the first pressing block 712 that is away from the locking switch 711, and is used to provide a force for the fastening pin 713 to extend into the adjustment hole 721. The fastening pin 713 is further provided with a first clamping protrusion 7131, one end of the second elastic element 714 can abut against the surface of the first pressing block 712 that is away from the locking switch 711, and the other end of the second elastic element 714 abuts against the end surface of the first clamping protrusion 7131. Specifically, when adjusting the exposed area of ​​the connecting component 720, if the user rotates the locking switch 711 to make the fastening pin 713 rise and move out of the adjustment hole 721, the second elastic element 714 will produce elastic deformation. At this time, when the connecting component 720 is adjusted to a suitable position, the user does not need to rotate the locking switch 711, but only needs to release the locking switch 711. The fastening pin 713 will move downward under the elastic action of the second elastic element 714 and enter the adjustment hole 721 to lock the connecting component 720. At the same time, the locking switch 711 will also synchronously descend to the initial position along the slope 7121.

[0031] Based on the above embodiments, Fig.16 and Fig.18 As shown, a mounting frame 610 is provided at the bottom of the seat cushion 600, and a receiving through hole 611 extending along the extending direction of the seat cushion 600 is provided on the mounting frame 610; one end of the connecting component 720 away from the leg support body 730 is located in the receiving through hole 611, and when the user moves the connecting component 720 along the extending direction of the seat cushion 600, the connecting component 720 moves in the above-mentioned receiving through hole 611. In this embodiment, the first pressing block 712 is fixed to the top of the mounting frame 610, one end of the fastening pin 713 is connected to the locking switch 711, and the other end of the fastening pin 713 passes through the first pressing block 712 and the top of the mounting frame 610 into the above-mentioned receiving through hole 611 and extends into any adjustment hole 721 of the connecting component 720.

[0032] Based on the above embodiments, Fig.19 As shown, the end of the leg support body 730 is rotatably connected to the end of the connecting component 720. A plurality of first through holes 7313 are arranged in a circumferential array at the end of the leg support body 730, and a retractable first locking pin 734 is arranged at the end of the connecting component 720. The first locking pin 734 is located on one side of the first through hole 7313, and the first locking pin 734 is staggered with any first through hole 7313 to form a rotation angle of the leg support body 730. The first locking pin 734 can be retractably arranged at the end of the connecting component 720 through a third elastic element 739 such as a spring.

[0033] In this embodiment, Fig. 20As shown, when the user sits on the foldable wheelchair 10, there is an initial angle between the leg support body 730 and the connecting part 720; the user can change the angle between the leg support body 730 and the connecting part 720 by rotating the leg support body 730 relative to the connecting part 720 by a certain angle, so that the leg support body 730 can support the user's legs and allow the user to sit on the foldable wheelchair 10 in a more comfortable posture. Specifically, as Fig.21 As shown, when the user initially sits on the folding wheelchair 10, the user can rotate the leg support body 730 relative to the connecting member 720. The end of the leg support body 730 has a first end surface 7311 facing the end of the connecting member 720. During the rotation of the leg support body 730, the first locking pin 734 abuts against the first end surface 7311. Fig. 22 As shown, when the rotation angle of the leg support body 730 reaches the target angle, the first locking pin 734 enters the target through hole to lock the leg support body 730 so that the leg support body 730 remains at the current angle, wherein the target through hole is any one of the multiple first through holes 7313, and the misalignment angle between the target through hole and the first locking pin 734 before the leg support body 730 rotates is the target angle. Exemplarily, two first through holes 7313 may be provided on the leg support body 730, and the misalignment angle between the first first through hole 7313 and the first locking pin 734 is 45°, and the misalignment angle between the second first through hole 7313 and the first locking pin 734 is 90°. Fig.23 As shown, when the leg rest body 730 rotates 45° counterclockwise from the initial angle, the first locking pin 734 enters the first through hole 7313 to lock the leg rest body 730, so that the leg rest body 730 remains at the current angle.

[0034] Of course, it is understandable that Fig.19 As shown, the first rotating shaft 738 of the leg support body 730 is axially fixedly penetrated through the end of the leg support body 730 and the end of the connecting component 720; the above-mentioned multiple first through holes 7313 can be arranged around the above-mentioned first rotating shaft 738.

[0035] Based on the above embodiments, Fig.19 , Fig.21 , Fig. 22 and Fig.24As shown, the folding wheelchair 10 further includes a first unlocking assembly 736, which is located at the other side of the first through hole 7313; the first unlocking assembly 736 is provided with a plurality of first unlocking pins 7361, each of which extends into the corresponding first through hole 7313. The number of the first unlocking pins 7361 is equal to the number of the first through holes 7313, and each of the first unlocking pins 7361 extends into the first through hole 7313. It can be seen that the first unlocking pins 7361 and the first locking pins 734 extend into the corresponding first through holes 7313 in opposite directions. When the user rotates the leg rest body 730 to a certain angle, the first locking pin 734 extends into the corresponding first through hole 7313 to lock the leg rest body 730. At this time, if the user wants to change the rotation angle of the leg rest body 730, it is necessary to first use the first unlocking component 736 to perform an unlocking operation. When unlocking, the user pushes the first unlocking component 736 toward the first locking pin 734 so that the first unlocking pin 7361 pushes the first locking pin 734 out of the first through hole 7313. After successful ejection, the unlocking operation is completed, and the user can adjust the rotation angle of the leg rest body 730 in the manner of the above embodiment.

[0036] Of course, it is understandable that Fig.19 and Fig.24 As shown, a fourth elastic element 7363 and a guide column 7362 may be provided between the first unlocking component 736 and the end of the leg support body 730. When the user pushes the first unlocking component 736 toward the first locking pin 734, the fourth elastic element 7363 elastically deforms the first unlocking component 736, and the first unlocking component 736 moves along the above-mentioned guide column 7362; when the first unlocking pin 7361 pushes the first locking pin 734 out of the first through hole 7313, when the user stops pushing the first unlocking component 736, the above-mentioned fourth elastic element 7363 restores the elastic deformation and makes the first unlocking component 736 move along the above-mentioned guide column 7362 toward away from the first unlocking pin 7361 to the initial position when the user does not push the first unlocking pin 7361.

[0037] In one possible implementation, Fig.24As shown, the guide column 7362 includes a fixed section 73623, a guide section 73622 and a contact section 73621 connected in sequence. The connecting component 720 has a second end face 7312 opposite to the first end face 7311, and the fixed section 73623 extends into the leg support body 730 through the second end face 7312 and is fixed in the leg support body 730; a countersunk hole is provided in the first unlocking component 736, and the diameter of the countersunk hole gradually decreases along the direction close to the leg support body 730, and the contact section is located in the hole with a larger diameter in the countersunk hole; the fourth elastic element 7363 is sleeved on the guide section 73622 and one end is in contact with the second end face 7312, and the other end is in contact with the first unlocking component 736. It can be understood that the above-mentioned guide column 7362 and the fourth elastic element 7363 can be provided in plurality, each of which is installed in the above-mentioned manner, and the plurality of guide columns 7362 can be symmetrical about the extension direction of the first rotation axis 738.

[0038] Based on the above embodiments, Fig.19 , Fig.21 , Fig. 22 and Fig.24 As shown, the end of the leg support body 730 has a first protrusion 731 and a second protrusion 732 arranged at intervals, a mounting groove 733 is formed between the first protrusion 731 and the second protrusion 732, and the end of the connecting component 720 is located in the mounting groove 733; the first rotating shaft 738 of the leg support body 730 is fixedly penetrated through the first protrusion 731, the end of the connecting component 720 and the second protrusion 732, the above-mentioned first through holes 7313 are distributed in a circumferential array on the first protrusion 731, and a plurality of second through holes 7321 are distributed in a circumferential array on the second protrusion 732, and a first locking pin 73 is provided in the end of the connecting component 720. 4 and the second locking pin 735, a third elastic element 739 is connected between the first locking pin 734 and the second locking pin 735, the first locking pin 734 and the second locking pin 735 extend through both sides of the connecting component 720, the second locking pin 735 is staggered with any second through hole 7321 to form a rotatable angle of the leg support body 730; wherein, the implementation method of the second locking pin 735 is the same as the implementation method of the first locking pin 734 in the above-mentioned embodiment, which will not be repeated here; the implementation method of the second through hole 7321 is the same as the implementation method of the first through hole 7313 in the above-mentioned embodiment, which will not be repeated here.

[0039] Similarly, in this embodiment, in addition to the first unlocking component 736, a second unlocking component 737 is also included. The implementation method of the second unlocking component 737 is the same as the implementation method of the first unlocking component 736 in the above embodiment, and will not be repeated here. Fig.19As shown, a limiting protrusion 7331 is provided in the mounting groove 733. When the leg support body 730 is at the initial angle, the limiting protrusion 7331 abuts against the end of the connecting component 720, so that the leg support body 730 can be stably maintained at the current angle. In this embodiment, when the user sits on the folding wheelchair 10, the leg support body 730 is at the initial angle. At this time, the user can rotate the leg support body 730. After rotating a certain angle, the first locking pin 734 extends into the corresponding first through hole 7313 to lock the leg support body 730; the second locking pin 735 extends into the corresponding second through hole 7321 to lock the leg support body 730.

[0040] When the leg support body 730 is unlocked, the first unlocking assembly 736 pushes the first locking pin 734 out of the first through hole 7313, and the second unlocking assembly 737 pushes the second locking pin 735 out of the second through hole 7321. After the first locking pin 734 and the second locking pin 735 are both pushed out, unlocking is completed and the user can adjust the angle of the leg support body 730.

[0041] In one embodiment, the applicant has found that the length ratio relationship of the straight line formed by each hinge point in the first four-bar linkage assembly and the position relationship between each hinge point in the first four-bar linkage assembly will affect the length and volume of the foldable wheelchair 10 after folding, which is specifically described below: In the embodiment of the present application, in the first four-link assembly, hinge point A, hinge point B, hinge point C and hinge point D are all located below the center plane of the seat cushion 600. The positional relationship between hinge point A, hinge point B, hinge point C and hinge point D satisfies AB:BC:CD:DA=1:(0.8~1.05):(2.08~8.48):(1.76~8.39); wherein AB is the straight line formed by hinge point A and hinge point B, BC is the straight line formed by hinge point B and hinge point C, CD is the straight line formed by hinge point C and hinge point D, and DA is the straight line formed by hinge point D and hinge point A; the above positional relationship represents the length relationship between the straight lines.

[0042] In the prior art, the positional relationship between the hinge points in the first four-link assembly is: AB: BC: CD: DA = 1: (1.1~1.2): (2.35~3.8): (2.4~3.9); and in the prior art, hinge point A is usually set above the center plane of the seat cushion 600, and hinge point B, hinge point C, and hinge point D are set below the seat cushion 600.

[0043] 1. When the positional relationship between the hinge points in the first four-link assembly of the folding wheelchair 10 and the length ratio relationship of the straight line formed by the hinge points are the same as those in the embodiment of the present application, the applicant finds that: (1) When AB:BC:CD:DA=1:1.05:8.48:8.39, Fig.25 As shown, the height of the foldable wheelchair 10 in the unfolded state is 930 mm, and the length of the foldable wheelchair 10 is 780 mm; Fig.26 As shown, the height of the foldable wheelchair 10 in the folded state is 299 mm, and the length of the foldable wheelchair 10 is 649 mm.

[0044] (2) When AB:BC:CD:DA=1:0.9:3.24:3.02, Fig. 27 As shown, the height of the foldable wheelchair 10 in the unfolded state is 930 mm, and the length of the foldable wheelchair 10 is 780 mm; Fig.28 As shown, the height of the foldable wheelchair 10 in the folded state is 299 mm, and the length of the foldable wheelchair 10 is 649 mm.

[0045] (3) When AB:BC:CD:DA=1:0.8:2.08:1.76, Fig.29 As shown, the height of the foldable wheelchair 10 in the unfolded state is 930 mm, and the length of the foldable wheelchair 10 is 780 mm; Fig.30 As shown, the height of the foldable wheelchair 10 in the folded state is 297 mm, and the length of the foldable wheelchair 10 is 659 mm.

[0046] 2. When the positional relationship between the hinge points in the first four-link assembly of the folding wheelchair 10 and the length ratio relationship of the straight line formed by the hinge points are the same as those in the prior art, the applicant found that: (1) When AB:BC:CD:DA=1:1.1:2.35:2.4, Fig.31 As shown, the height of the foldable wheelchair 10 in the unfolded state is 930 mm, and the length of the foldable wheelchair 10 is 780 mm; Fig.32 As shown, the height of the foldable wheelchair 10 in the folded state is 304 mm, and the length of the foldable wheelchair 10 is 699 mm.

[0047] (2) When AB:BC:CD:DA=1:1.15:2.9:3.0, Fig.33 As shown, the height of the foldable wheelchair 10 in the unfolded state is 930 mm, and the length of the foldable wheelchair 10 is 780 mm; Fig.34 As shown, the height of the foldable wheelchair 10 in the folded state is 304 mm, and the length of the foldable wheelchair 10 is 701 mm.

[0048] (3) When AB:BC:CD:DA=1:1.2:3.8:3.9, Fig.35 As shown, the height of the foldable wheelchair 10 in the unfolded state is 930 mm, and the length of the foldable wheelchair 10 is 780 mm; Fig.36 As shown, the height of the foldable wheelchair 10 in the folded state is 301 mm, and the length of the foldable wheelchair 10 is 701 mm.

[0049] Among them, in the above embodiments, no matter the folding wheelchair 10 is set according to the parameters in the embodiment of the present application or according to the parameters in the prior art, the diameter of the front wheel 101 of the folding wheelchair 10 is 186 mm, and the diameter of the rear wheel 301 of the folding wheelchair 10 is 254 mm.

[0050] It can be seen from the above content that when the length and height of the folding wheelchair 10 are the same in the unfolded state, when the positional relationship between the hinge points in the first four-link assembly of the folding wheelchair 10, and the length ratio relationship of the straight line formed by the hinge points are the same as those in the embodiment of the present application, the length and height of the folding wheelchair 10 are shorter after folding, and the length can be shortened by about 1 / 10 compared with the prior art, and the wheelchair has a more compact structure after folding; when the width after folding is the same, if the length and height of the wheelchair are shorter, the occupied area and volume are also smaller, which is conducive to storing the folding wheelchair 10 in a small space, thereby improving the user experience.

[0051] Furthermore, in the embodiment of the present application, in the second four-link assembly, hinge point G and hinge point F are located on the center plane of the seat cushion 600, and hinge point E and hinge point A are located below the center plane of the seat cushion 600; the positional relationship between hinge point E, hinge point F, hinge point G and hinge point A satisfies EF:FG:GA:AE=(2.59~16.3):(4.86~20.4):1:(3.02~5.19); wherein EF is the straight line formed by hinge point E and hinge point F, FG is the straight line formed by hinge point F and hinge point G, GA is the straight line formed by hinge point G and hinge point A, and AE is the straight line formed by hinge point A and hinge point E; the above positional relationship represents the length relationship between the straight lines.

[0052] Fig.25 and Fig.26 The positional relationship between the hinge points in the second four-link assembly satisfies EF:FG:GA:AE=2.59:4.86:1:3.02; Fig. 27 and Fig.28 The positional relationship between the hinge points in the second four-link assembly satisfies EF:FG:GA:AE=4.37:7.44:1:3.86; Fig.29 and Fig.30The positional relationship between the hinge points in the second four-bar linkage assembly satisfies EF:FG:GA:AE=16.3:20.4:1:5.19. It can be seen that when the positional relationship between the hinge points in the second four-bar linkage assembly of the folding wheelchair 10 and the length ratio relationship of the straight line formed by the hinge points are the same as those in the embodiment of the present application, the folding wheelchair 10 is parallel to the backrest 200 after being folded, and the center of gravity of the wheelchair is stable after being folded, and it is not easy to tip over.

Claims

1. A folding wheelchair, characterized in that: The folding wheelchair comprises: a backrest and a rear support hinged to the backrest and forming a hinge point B; A first locking shaft is provided at the end of the rear support, A first locking hook rotatably disposed at an end of the backrest; The first lock hook is provided with a first hook groove and a second hook groove, and when the foldable wheelchair is in an unfolded state, the first hook groove is engaged with the first locking shaft, and when the foldable wheelchair is in a folded state, the second hook groove is engaged with the first locking shaft; When the folding wheelchair is in the unfolded state and the folded state, the first hook groove is located on one side of the hinge point B, and the second hook groove is located on the other side of the hinge point B; a line connecting the first hook groove and the hinge point B, and a line connecting the second hook groove and the hinge point B, form a target angle, and the target angle is equal to the relative rotation angle of the backrest and the rear support before and after the folding wheelchair is folded, the distance between the first hook groove and the hinge point B is equal to the distance between the hinge point B and the first locking axis, and the distance between the second hook groove and the hinge point B is equal to the distance between the hinge point B and the first locking axis.

2. The folding wheelchair according to claim 1, characterized in that: The first locking hook includes a rotating part rotatably connected to the backrest, a first locking part connected to the rotating part and extending along a first direction, and a second locking part connected to the rotating part and extending along a second direction; one end of the first locking part away from the rotating part is connected to a first hook body opposite to the extending direction of the second locking part to form the first hook groove; one end of the second locking part away from the rotating part is connected to a second hook body in the same extending direction as the first locking part to form the second hook groove.

3. The folding wheelchair according to claim 2, characterized in that: A limiting through hole is provided on the backrest, and the first locking portion is located in the limiting through hole; the limiting through hole has a first surface and a second surface relative to each other, and when the first lock hook rotates, the first locking portion can rotate from abutting against the first surface to abutting against the second surface, or the first locking portion can rotate from abutting against the second surface to abutting against the first surface.

4. The folding wheelchair according to claim 1, characterized in that: The folding wheelchair also includes a front support and a pull rod, one end of the pull rod is hinged to the rear support to form a hinge point C, the other end of the pull rod is hinged to the front support, and the first locking axis is the hinge point C.

5. The folding wheelchair according to claim 1, characterized in that: A first elastic element is provided between the first locking hook and the backrest, and the first elastic element is used to provide a force to enable the first hook groove and the second hook groove to engage with the first locking shaft.

6. The folding wheelchair according to claim 5, characterized in that: A rotating shaft is provided at the end of the backrest, the first elastic element and the first locking hook are sleeved on the rotating shaft, one end of the first elastic element is connected to the end of the backrest, and the other end of the first elastic element is connected to the first locking hook.

7. The folding wheelchair according to any one of claims 1 to 6, characterized in that: The folding wheelchair also includes: A second locking hook having the same shape as the first locking hook, wherein the first locking hook and the second locking hook are symmetrically arranged at the end of the backrest; The second locking shaft is located on the other rear support and is arranged opposite to the first locking shaft. The second locking hook is used to engage with the second locking shaft.

8. The folding wheelchair according to claim 7, characterized in that: The first locking hook and the second locking hook are connected by a connecting rod, and the connecting rod surrounds the outside of the first locking hook and the second locking hook and is located between two rear supports.

9. The folding wheelchair according to claim 1, characterized in that: The folding wheelchair also includes a seat cushion hinged to the backrest; A leg support assembly, comprising an adjusting component, a leg support body, and a connecting component connected to the adjusting component and the leg support body; The connecting component is provided with a plurality of adjustment holes arranged along the extension direction of the seat cushion, and the adjustment component includes a locking switch, a pressure block and a fastening pin; the pressure block is connected to the bottom of the seat cushion, one end of the fastening pin is connected to the locking switch, and the other end passes through the pressure block and extends into any adjustment hole located below the pressure block; Wherein, a slope is provided on the surface of the pressing block facing the locking switch; when the locking switch rotates, it rises along the slope, and the rising of the locking switch drives the fastening pin to move out of the adjusting hole.

10. The folding wheelchair according to claim 9, characterized in that: The end of the leg support body can be rotatably connected to the end of the connecting component; a plurality of through holes are distributed in a circular array at the end of the leg support body, and a retractable locking pin is provided at the end of the connecting component, the locking pin is located on one side of the through hole, and the locking pin is staggered with any of the through holes to form a rotation angle of the leg support body.

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